I'd like to know what the difference is between click on the Minus Front
option in the Pathfinder palette and Alt+click.
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Alt+click keeps the pathfinder operation as a compound path of both original paths. This way, you can re-edit the paths, while still seeing the Pathfinder effect.
Just click will Expand
the operation right away, discarding the original shapes in favour of the new one.
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1Of note. This behavior is the exact opposite in Illustrator CS3 or earlier. Adobe reversed the behavior in Illustrator CS4 forward. – Scott Sep 11 '14 at 15:27
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